Brand color
Slack Secondary
#730394rgb(115, 3, 148)hsl(286, 96%, 30%)oklch(0.416 0.202 315.3)Slack Secondary on this page is the real value, not a screenshot: exact hex, RGB, HSL and OKLCH, ten tints and ten shades, classic harmonies, and WCAG contrast with fixes — plus the 1 public brand that uses it and the palettes it appears in.
Colors that go with Slack Secondary
Forest Green, Charcoal and Crimson lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Forest Green #228b22
complementaryForest Green sits directly opposite Slack Secondary on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Charcoal #36454f
neutralshippedCharcoal is the text near-black for Slack Secondary: softer than #000 and cool enough to feel like part of the same palette.
Crimson #dc143c
shippedCrimson is paired with Slack Secondary in 3 real palettes, including Lenovo's brand system and Gemstone, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with Slack Secondary: 3 real palettes, including Slack's brand system and Hinge's brand system, as the lead colour.
Teal #008080
triadicshippedTeal completes a triad with Slack Secondary — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Sea Green #2e8b57
split-complementSea Green is a split-complement of Slack Secondary: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Olive Green #808000
split-complementOlive Green is a split-complement of Slack Secondary: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Blue Violet #8a2be2
shippedBlue Violet is paired with Slack Secondary in two real palettes: Taco Bell's brand system and Twitch's brand system, as the supporting colour.
Real palettes that use Slack Secondary
Tints & shades
Harmonies
Contrast
| Slack Secondary as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 9.68:1 | pass | pass | pass | Passes AAA — no fix needed. |
Aaon black | 2.17:1 | fail | fail | fail |
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with Slack Secondary as the background.
Brands using this color
Fonts for this mood
Slack Secondary reads as cool, vivid, dark. The font library is tagged with the same vocabulary:
Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #730394 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/730394-bd9fc1-adcb62-2d1f2a-ece9f1?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md